Meike Metal Mount Auto Focus Macro Extension Tube for CANON The AF Extension Tube Set can transform your Lens into a Macro Lens.This is used by attaching between camera body and lens of the 35mm single-lens reflex camera. It couples perfectly with the camera's automatic diaphragm. Tube diameter : ab.62mm. Tube Lengths: (1) 13mm.(2) 21mm.(3)31mm. This extension tube consists of 5 parts: 13mm tube, 21mm tube, 31mm tube, Front Cap, Rear Cap. Package includes: Metal mount Auto Focus Macro Extension Tube Set x1, English User Manual x1 Material:Brass Chromed mount + ABS(Acrylonitrile Butadiene Styrene) body, color : black Compatible with: Canon EOS EF EF-S SLR and Lens.